Full-color emission glass phosphor and preparation method thereof

Abstract

The invention discloses a full-color emission glass phosphor for near ultraviolet or blue light stimulating white light LEDs (Light Emitting Diodes) and a preparation method thereof. The glass phosphor is a rare earth ion doped glass phosphor containing silver ion polymers. The preparation method comprises the following steps of: by using a glass system as a substrate and AgNO3 as a raw material, introducing silver ion polymers into the glass material; and by using rare earth ions such as Eu3+, Sm3+, Pr3+, Tb3+, Dy3+, Er3+ or Ho3+ as a luminescence center, singly or jointly doping the rear earth ions in the glass substrate to be matched with the silver ion polymers for giving out white lights. The single glass phosphor is used for replacing fluorescent powder for the traditional white light LED and encapsulating materials, thereby simplifying the packaging technology; and the full-color emission glass phosphor has the advantages of being capable of solving the aging problem of the while light LED devices, increasing the stability of the devices, increasing the stimulation efficiency on the rare earth ions and realizing the high brightness fluorescence-emission.

Description

technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a full-color emitting glass phosphor for near-ultraviolet or blue light excitation white light LED and a preparation method thereof. Background technique [0002] Energy saving and environmental protection are the themes of the current era. In order to solve the increasingly tense energy crisis, the development of new, environmentally friendly and energy-saving lighting equipment has become a topic of widespread concern. Compared with traditional lighting equipment, solid-state lighting based on white light-emitting diodes (Light Emitting Diode, LED) has many advantages such as energy saving, environmental protection, stability and long life, so it is considered the most ideal lighting tool for the next generation. Therefore, the development of solid-state lighting dominated by white LEDs is of great significance to alleviating the energy cri...

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Problems solved by technology

[0005] (1) Phosphor powder has obvious light decay, which causes white light to drift easily;

[0006] (2) The currently widely used phosphor coating process is manual dispensing coating, which is likely to cause uneven thickness of the phosphor coating layer, directly affect the uniformity of light output, and increase the complexity of the process;

[0007] (3) The rare earth luminescent centers commonly used in phosphors are mainly limited to Eu 2+ and Ce 3+ , their transitions in the blue light region are broadband f-d transitions, while other trivalent rare earth ions are narrow-band f-f transitions in the blue light region, which is not conducive to obtaining fluorescence emission with high external quantum efficiency, thus limiting the types of rare earth ions that can be selected;

[0008] (4) The epoxy resin material used for encapsulation has poor UV radiation resistance and temperature stability, which causes white LEDs to age easily and seriously reduces the service life of white LED light sources

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